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首页> 外文期刊>Journal of visualization >Quasi-streamwise counter-rotating vortices generated by convergent riblets in flat plate boundary layer
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Quasi-streamwise counter-rotating vortices generated by convergent riblets in flat plate boundary layer

机译：平板边界层中会聚棱纹产生的准流反向旋涡

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摘要

Flow structures initiated by multiple convergent riblets, arranged in tandem, in the developing laminar boundary layer on a flat plate were qualitatively studied for a flow velocity of 1.5 m/s by means of smoke wire flow visualization. Two different configurations with varying pitch, 3 and 1.5 mm, and a constant height 3 mm, had been considered. Results depict the development of mushroom-like counter-rotating vortices accompanied by symmetrically distributed small-scale co-rotating vortices and subsequent breakdown of the structures. Though the variation of pitch indicates similar flow structures, the point of breakdown of the structures was found to vary significantly. The probable reasons for the breakdown of the structures have also been discussed.
机译：通过烟丝流动可视化，定性研究了在平板上正在发展的层流边界层中串联排列的多个会聚肋条引发的流动结构，其流速为1.5 m / s。已经考虑了两种不同的结构，其螺距为3和1.5 mm，高度恒定为3 mm。结果描述了蘑菇状的反向旋转涡流的发展，伴随着对称分布的小规模的双向旋转涡流以及随后结构的破裂。尽管螺距的变化表示相似的流动结构，但是发现结构的破裂点有很大的变化。还讨论了结构损坏的可能原因。

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